Drum for concrete-mixing machines



May 28, 1929. GJJAEGER ET AL 1,714,602

DRUM FOR CONCRETE MIXING MACHINES Filed Feb. 10, 1928.

Em -why GEBHARD JAEGER JOSEPH EGGERT 5&9} attorneys Patented May 28,1929,

UETE STT I V IJMtQZ GEBHARD JAEGER AND JOSEPH EGGERT, 'OF COLUMBUS,OHIO,: ASSIGNORS TO ,THE' JAEGEB MACHINE COMPANY, OF COLUMBUS, OHIO, ACORPORATION OF OHIO.

DRUM FOR OOIlCRETE-MIXING MACHINES.

Application filed February 10, 1928. Serial No. 253,313.

This invention relates to concrete mixing devices of the rotating andtilting variety, that has a single opening for the reception anddischarge of the concrete forming material, the object 01 the inventionbeing to provide a mixing device or drum of im-' proved construction,whereby the mixing of the line and coarse material is more rapidly andthoroughly performed than hith erto. v a r The invention is embodied inthe-construction and combination of features shown in the accompanyingdrawing and set forth a in the following description and claims.

In said drawing:

Figure 1 is a perspective View looking into the interior of the drum.

Figure 2 is a combined side elevation and central section of the drum.

Figure 3 is aview in side elevation showing the drum mounted on astandard and in normal mixing position, preparatory to discharging themixed contents.

The body of vthe drum is constructed with a frusto-conical upper wall 5,fixed to a bowl portion having oppositely curved walls 6, 6, andopposite flat walls 7, 7, joined to said walls 6, 6, and a diametricalbottom portion 8, thereby forming four corners in the side of the bowlbetween said flat and curved portions. The flat walls 7, 7, form ineffect a peculiar interruption of the con tinuity of the otherwisecurved surface of the bowl and it the drum be rotated while its axis isat an angle to the vertical, as for example as seen in Fig. 3, themovement of the material is alternately retarded and speeded by the flatand curved surfaces respectively of the bowl.

Cooperating with the peculiar form of said walls of the bowl are twoblades, each composed mainly of two parts, to-wit: an outer part orblade 9 of relatively wide trapezoidal form, roughly, and a long narrowblade, 10, secured thereto and extending therefrom toward the bowl ofthe drum. The larger part, 9, of the blade is affixed to the wall of thedrum to stand at an angle of approximately to the plane of the axis ofthe drum, and its corner next the wall and mouth of the drum is bentinward, as seen at 9 in the direction of the normal direction of motionof the drum; and the narrow blade 1.0 secured to stand nearly parallelto the well of the and it is curved forwardly in the direction of itsmotion from the point of its connection with the blade 9, all as bestseen in Fig. 1. The said blades are secured to the interior drumby'means of brackets,asshown at 11 and 12, bolted to the blade and drum.

The drum is supported upon a yoke 13 iaving'a spindle fixed on the yokethat enters a tubular bearing let rising from the center of the bottomof the drum. This yoke has at its opposite ends trunnions that'areournaled m standards 15 so that by swlnging the yoke the drum can beoscillated or tilted as by handles 16 connected with one of thetrunnions to different positions for supplying the materials to thedrum, mixing and dis charging the same. The drumis also provided with acircumferential rack 17 engagedby a pinion 18 to impartv a rotary motionto the drum. Thetiltingand rotary motions of the drum are effectedindependently of each other. The construction in respect of the meansfor tilting and rotating the drum invarious forms/are well known in theart and require no further detailing here.

tion opposite that appearing in Fig, 3. The

drum is then slowly swung over to approximately the horizontal positionshownvin Fig. 3, in which position the principal mixing operation takesplace. In this position the material is moved back and forth withreference to the mouth and bowl of the drum. In this mixing operation,the concrete material is'carried in the lower portion of the drum (inthe substantially horizontal position) in a general way with the motionof the drum, the fiat surfaces of the bowl tending to retard and pushthe mass of the material towards the mouth of the drum, and the materialbeing lifted by the narrow and wide portions of the blade. Whensutliciently elevated, the material slides oil the wide portionoit theblade back again toward the lower side of the bowl, and when thematerial slides from such larger portion of the blade it fallsmostly-upon the wall of the drum in advance of the oncoming oppositeblade. The effect on the moist materials is a kneading, stirring andswirling operatioii due to the cooperation of the peculiar form of theblades with the form it its and, eourse, when in. the sub ing opening,the bottom of said drum having curved and flat walls alternating witheach other, and a. blade in said drum consisting of a Wide portion fixedin a position inclined to the wall of the drum adjacent to the open ingthereof, and a narrow portion extending from said wide portion to nearthe bottom of thodrum and curv-edly toward the axis of the drum, meansfor rotating said drum, and means for tilting the same.

2. In a concrete mixing machine, a mixing drum having a single chargingand discharging opening, the bottom of said drum having curved and flatwalls alternating with each other, and a blade in said drum consistingof a wide portion fixed in a position inclined to the wall of the drumadjacent to the opening thereof, a portion of said blade next the wallof the drum being bent in the direction of its motion, and a narrowportion extending from said wide portion to near the bottom of the drum,means for rotating said drum and means for tilting the Same.

4:. In a concrete mixing machine, a mixing drum havlng a smgle chargingand dischargmg openmg, a blade 1n said drum consisting of a wide portionfixed in a position inclined to the wall of the drum ad acent theopening thereof, and a narrow portion extending from said wide portionto near the bottom of the drum, said narrow portion being more offsetfrom the wall of the drum than said wide portion, means for rotatingsaid drum, and means for tilting the same.

5. In a concrete mixing machine, a mixing drum having a single chargingand discharging opening, a blade in said drum con sisting of a. wideportion fixed in a position inclined to the wall of the drum adjacentthe opening thereof, and a narrow portion extending from said wideportion to near the bottom of the drum, means for rotating said drum andmeans for tilting the same, and means in the bottom of the drum forpressing the concrete material toward said opening of the drum whenrotated in substantially horizontal position, said wide portion of theblade adapted to return the concrete material toward the bottom of thedrum in such horizontal position.

GEBHARD JAEGEB. JOSEPH EGGERT.

